Regarding your first problem:

The normal way to use MarkerManager is to have *one* MarkerManager
instance to which you add lots of markers. If you do it that way, then
you can write

function clearMarkers() {
  mgr.clearMarkers();
}

What your code does is create lots of MarkerManager instances, each of
which handle one marker. Your "mgr" variable is a reference to the last
MarkerManager that you created, so you can only make calls that affect
the marker that that MarkerManager manages.

-- 
http://econym.googlepages.com/index.htm
The Blackpool Community Church Javascript Team


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